m03 # 11 question

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m03 # 11 question [#permalink]

29 Jun 2011, 06:52

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If x is an integer, is x even?

1. 11/x is an integer
2. 22/x is an integer

I am confused on this one. Can someone please help? Thanks!

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Re: m03 # 11 question [#permalink]

29 Jun 2011, 06:55

(1) says

11/x is an integer

We know that 11 is a prime, so it can be divisible only by 1 or 11, so x = 1 or 11

=> x is odd, and the answer to the question is a definite No.

Thus (1) is Sufficient

(2) says 22/x is integer, but now x can be 1,2,11,22

=> x can be odd/even

So (2) is not sufficient

Answer - A
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Re: m03 # 11 question [#permalink]

26 Feb 2012, 16:16

Why couldn't X be zero? 11/0 = 0 which is an even integer. That would make the answer E.

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Re: m03 # 11 question [#permalink]

26 Feb 2012, 16:35

hummcon wrote:

Why couldn't X be zero? 11/0 = 0 which is an even integer. That would make the answer E.

Welcome to GMAT Club. Below is an answer to your question.

Division by zero is undefined, so 11/0 is not allowed. The question should mention that x does not equal to zero to avoid confusion. It will be corrected for the next edition.

For more on number properties check Number Theory chapter of Math Book: math-number-theory-88376.html

Hope it helps.
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Re: m03 # 11 question [#permalink] 26 Feb 2012, 16:35

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m03 # 11 question

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